.mid > div {
    border: 1px solid gray;
    width: 900px;
    /*padding: 30px 0 30px 0;*/
    margin: 30px 0 30px 0;
}

.describe {
    text-align: center;
    margin: 30px 0;
}

.describe > div:nth-child(1) > div:nth-child(1) {
    font-size: 30px;
    color: rgb(230, 145, 55);
}

.describe > div:nth-child(1) > div:nth-child(2) {
    font-size: 15px;
    color: gray;
}

.describe > div:nth-child(2) {
    font-size: 10px;
    color: darkblue;
}

/*-------------------表单------------*/
.online {
    /*border: 1px solid red;*/
    width: 500px;
}

/*元素选择器*/
input {
    width: 500px;
    height: 30px;
    background-color: rgb(238, 238, 238);
    border: 1px dashed gray;
    padding: 0 10px;
}

textarea {
    width: 500px;
    background-color: rgb(238, 238, 238);
    border: 1px dashed gray;
    padding: 10px;
    height: 100px;
    /*只能纵向拖动*/
    resize: vertical;
    /*最小高度*/
    min-height: 100px;
}

.online > div > div > div {
    line-height: 30px;
}

input[type=submit] {
    margin: 30px;
    /*padding: 10px 30px;*/
    width: 200px;
    height: 32px;
    line-height: 30px;
    background-color: rgb(230, 145, 55);
    color: white;
    border-radius: 0 50px 50px 0;
    box-shadow: 5px 5px 3px 3px crimson;
}